CN108123690A - Doherty amplifier - Google Patents

Doherty amplifier Download PDF

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Publication number
CN108123690A
CN108123690A CN201711237150.4A CN201711237150A CN108123690A CN 108123690 A CN108123690 A CN 108123690A CN 201711237150 A CN201711237150 A CN 201711237150A CN 108123690 A CN108123690 A CN 108123690A
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amplifier
output
transmission lines
carrier
peak
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CN108123690B (en
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安德雷·格列别尼科夫
王业宏
渡边直树
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Sumitomo Electric Device Innovations Inc
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Sumitomo Electric Device Innovations Inc
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0288—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor
    • H03F3/3001—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor with field-effect transistors
    • H03F3/3044—Junction FET SEPP output stages
    • H03F3/305—Junction FET SEPP output stages with symmetrical driving of the end stage
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/60—Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators
    • H03F3/602—Combinations of several amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/192—A hybrid coupler being used at the input of an amplifier circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/405—Indexing scheme relating to amplifiers the output amplifying stage of an amplifier comprising more than three power stages
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

It will be stabilized with the Doherty amplifier of multiple peak amplifiers.In carrier-frequency amplifier (100) and three peak amplifiers (101~103) output and output coupler (30) between be inserted into offset units (20).Offset units are included is transformed to offset transmission lines short-circuit, that impedance is equal with load impedance by the output impedance of each amplifier.When all peak amplifiers disconnect, carrier-frequency amplifier is output into 12.5 Ω, via the transmission lines of 25 Ω by RF signal outputs.When only the 1st peak amplifier is connected, the output of carrier-frequency amplifier, the 1st peak amplifier is transformed to 25 Ω, is matched with the terminal of 50 Ω.Even if the 3rd peak amplifier is connected, output is also transformed to 50 Ω.

Description

Doherty amplifier
Technical field
The present invention relates to a kind of Doherty amplifiers with multiple peak amplifiers.
Background technology
In most communication system, power amplifier requirements high efficiency and high linearity are taken into account.But efficiency and The linearity is in the relation of compromise.Also, in GSM (the Global System for for the 2nd generation mode for belonging to mobile communication Mobile Communi100tions：For the global system of mobile communication)/and as its extended pattern belong to the 3rd generation mode EDGE (Enhanced data GSM Environment：Enhancing data GSM environment) or belong to the WDCMA in the 3rd generation (Wideband Code Division Multiple Access：Wideband code division multiple access)/belong to the LTE (Long in the 4th generation Term Evolution：Long Term Evolution) each standard in, to power amplifier requirements wide dynamic range export.If towards base Design of standing plays the power amplifier of peak efficiency with maximum output, then in low output, its efficiency reduces.Therefore, for base station Power amplifier, not only in maximum output, and in the low output less than or equal to -6dB also will by numerical control and with it is low into This realization efficiency and the linearity are taken into account, this is not easy to.
Patent document 1：European Patent No. 2403135B
Patent document 2：United States Patent Publication the 2013/0265107th
Patent document 3：United States Patent Publication the 2008/0284509th
In the Doherty amplifier with multiple peak amplifiers, the output that is synthesized to the output of peak amplifier The structure of synthesizer becomes complicated.Particularly, directly carried out in the output for the peak amplifier that will be disconnected in low output area In the circuit of synthesis, influenced be subject to parasitic capacitance, stray inductance for being appended hereto amplifier etc., it sometimes can not be by peak amplifier Output be strictly regarded as opening a way.In this case, as defined in can not expecting in the output coupling unit premised on open circuit Action, in addition, causing the efficiency reduction as Doherty amplifier entirety.
The content of the invention
Doherty amplifier according to the present invention has a carrier-frequency amplifier and multiple peak amplifiers, comprising：It is defeated Enter distributor, amplifier unit, offset units, output coupler.Input signal is allocated equally to carrier frequency by input distributor Amplifier and multiple peak amplifiers.Amplifier unit includes these carrier-frequency amplifiers and multiple peak amplifiers.Offset units With respectively with the corresponding multiple offset transmission lines of carrier-frequency amplifier and multiple peak amplifiers.Output coupler includes will Multiple coupling transmission lines that the output of these multiple offset transmission lines is coupled.It is put in Doherty according to the present invention In big device, multiple offset transmission lines are to become the output impedance when carrier-frequency amplifier and multiple peak amplifiers are each turned off It is changed to the transmission lines of short-circuit condition.
The effect of invention
The output impedance of each amplifier of open-circuit condition is temporarily transformed to short circuit by the output of each amplifier, therefore can Realize the stabilisation of the coupling function in output coupler.
Description of the drawings
Fig. 1 is the block diagram for the structure for representing existing Doherty amplifier.
Fig. 2 is to show schematically 3 grades, the figure of the relation of the output intensity of 4 grades of Doherty amplifier and efficiency.
Fig. 3 is the block diagram of the structure for the Doherty amplifier for representing 3 grades.
Fig. 4 is the block diagram of the structure for the Doherty amplifier for representing 4 grades.
Fig. 5 (a) be show schematically carrier-frequency amplifier, peak amplifier outlet side structure figure, Fig. 5 (b) is logical Cross the figure of the circuit shown in Smith chart upper table diagram 5 (a).
Fig. 6 is the output characteristics of Doherty amplifier shown in Fig. 4.
The explanation of label
100：Carrier-frequency amplifier, 101~103：Peak amplifier, 20：Input distributor, 20a~20c：Connector, ZT：Eventually End resistance, 30：Offset units, TL00~TL03：Deviate transmission lines, TLA~TLC、TL1~TL3：Synthesize transmission lines, TLT：It is defeated Go out transmission lines, 40：Output coupler.
Specific embodiment
In the following, referring to the drawings, the concrete example of Doherty amplifier according to the present invention is described in detail.This Outside, the present invention is not limited to these illustrations, but it is shown in the claims, in addition, comprising being equal with claims Whole changes in content and its scope.
Patent document 1 discloses the structure on multistage Doherty amplification.Doherty amplification disclosed in patent document 1 Device 100 is as shown in the functional block of Fig. 1 in this way, the structure with previously known dawn.With following structures, i.e. will be put with carrier frequency Big device 100With peak amplifier 101~103Common Doherty amplifier output via the transmission lines TL of multiple λ/4C~ TL2It is sequentially connected.Herein, amplifier 100It is carrier-frequency amplifier, amplifier 10n (n=1~3) is peak amplifier.In saturation Whole amplifier 10 during output0~103In an ON state, only carrier-frequency amplifier when with saturation the output phase than small more than 12dB 100It connects, peak amplifier 101~103Output all as open-circuit condition, therefore according to transmission lines TL1, node N1By regarding Make short circuit, from node N0The peak amplifier 10 of start of calculation1~103All it is considered open circuit.In leading-out terminal RFOUTIt is connected with 50 Ω Load in the case of, carrier-frequency amplifier 100Load impedance be endowed 502/(252/ 50)=200 Ω.It is being compared with saturation During the output of output -12dB~-6dB, carrier-frequency amplifier 100With peak amplifier 101As connection, slave carrier frequency at this time is put Big device 100Inclusive impedance will be loaded and from peak amplifier 10 by rising1Inclusive impedance will be loaded by, which rising, becomes 100 Ω, from node N0Inclusive impedance will be loaded as 12.5 Ω by rising, from leading-out terminal RFOUTRise will load it is inclusive Impedance matching is 50 Ω.If next, increasing output, further make the 2nd peak amplifier 102It is also switched on.At this point, from 1st peak amplifier 101Inclusive impedance will be loaded and from the 2nd peak amplifier 10 by rising2Inclusive resistance will be loaded by rising It is anti-to become 50 Ω, from switching node N0Inclusive impedance will be loaded as 12.5 Ω, realize impedance matching.If into one Step increases output, then the 3rd peak amplifier 103It connects, thus, it is possible to realize to maintain efficient amplification action in wide output area.
But in the structure of fig. 1, it is with peak amplifier 101~103Be output into premised on the situation of disconnection The structure of Doherty amplifier.If the field-effect transistor that the parasitic antenna consideration of amplifier is for example used as amplifier element Drain-Source between parasitic capacitance, with drain electrode, the bonding line of source electrode there is stray inductance etc., then with in low output area Compared premised on the situation that the output of domain peak amplifier is disconnected, using the output of peak amplifier be considered short circuit situation as Premise, can make the design of Doherty amplifier become easy.In addition, it also can steadily be amplified action.
Fig. 3 is the functional block diagram of 3 grades of Doherty amplifier, is following structures, i.e. by carrier-frequency amplifier 100, two A peak amplifier 101、102Respective output insertion transmission lines TL00~TL02, so as to by from the output of transmission lines by Each inclusive impedance of amplifier is set to short circuit.It is given to terminal RFINHigh-frequency signal input to 1：3 same phase partitioning device 20, using phase branch three outputs identical as intensity.On same phase partitioning device 20, such as enumerate the 1 of Wilkinson type：3 points Orchestration.Moreover, it only inputs to carrier-frequency amplifier 100Signal via the transmission lines of the length of λ/2, thus prolong the phase of the signal Slow 180 °.Each amplifier 100~102Output via with mutually isostructural (impedance Z0, the long L of circuit0Transmission lines TL00~ TL02) phaser 30 and input to outlet side coupler 40.Herein, impedance Z0, the long L of circuit0Being will be in peak amplifier 101、 102During disconnection, each from phaser 30 is exported peak amplifier 101、102Inclusive impedance is set to the impedance Z of short circuit0、 The long L of circuit0.On transmission lines TL00~TL02Effect, the detailed content of effect describes below.Carrier-frequency amplifier 100, peak It is worth amplifier 101、102It is mutually isostructural amplifier, therefore (is leaked as when disconnecting with identical output impedance from it Extreme son is risen the impedance including amplifier internal calculation).Transmission lines TL00~TL02Also relative to carrier-frequency amplifier 100, peak It is worth amplifier 101、102It is set to identical structure.3 grades of the symmetrical Doherty amplifier is as shown in Fig. 2, show three efficiency poles Value, maximum compensation are endowed 9dBc.
In two peak amplifiers 101、102It is set in the low output area disconnected, on from node N1It rises and amplifies peak value Device 101、102Inclusive impedance since the output of phaser 30 is regarded as short circuit, and is connected with tool in the near short circuit terminal There is the transmission lines TL of the circuit length of λ/41、TL2, therefore can be regarded as opening a way.Accordingly, with respect to from for three amplifiers 100~ 102Output switching node N0It rises node N1Inclusive impedance, due to what is grown via the circuit for being respectively provided with λ/4 Two transmission lines TLA、TLBConnection, thus can its can also be regarded as opening a way.Therefore, in peak amplifier 101、102Become In the low output area disconnected, transmission lines TLBAnd its following structure will not be to node N0Make any contribution.
In RFOUTTerminal with during 50 Ω terminals (in RFOUTWhen terminal is connected with the transmission lines with 50 Ω characteristic impedances), From node N0It rises the inclusive impedance of the terminal, is endowed ZT2/ 50, from for carrier-frequency amplifier 100Phaser 30 It has exported node N0The inclusive impedance in side is endowed (Z2/ZT)2×50.By to transmission lines TL00The long L of circuit0、 Its impedance Z0And impedance ratio (Z2/ZT) set, so as to which usually only carrier frequency amplifies in existing 2 grades of Doherty amplifier In the low output area of device action, the load of carrier-frequency amplifier is easily set to hundreds of Ω.
If input signal strength increases, become the 1st peak amplifier 101Also the initial compensatory zone acted, then close In from node N1It rises the 2nd peak amplifier 102Though being still in open-circuit condition, the 1st peak value is put for inclusive impedance Big device 101Inclusive impedance becomes virtual value.In this case, in switching node N0Place, the output of carrier-frequency amplifier via Transmission lines TL00、TLCIt is coupled, the 1st peak amplifier 101Output via transmission lines TL01、TL1、TLA、TLB It is coupled.Carrier-frequency amplifier 100With peak amplifier 101It is identical structure, therefore the phase of signal that two amplifiers generate Postpone it is identical, in addition, by two transmission lines TL00、TL01The phase delay of generation is also identical.Amplify accordingly, with respect to carrier frequency The output of device 100, the 1st peak amplifier 101Output generate λ/4 transmission lines quantity difference, i.e. λ/4 × 2=λ/2 Phase difference (the 1st peak amplifier 101Output delay).Carrier-frequency amplifier 100Input signal compared with peak amplifier 101、 102Input signal, by being inserted into transmission lines 20a, so as to have occurred that the delay of λ/2, therefore the 1st peak amplifier is defeated Go out via transmission lines TL1、TLA、TLBAnd with from carrier-frequency amplifier 100Output with identical phase to reaching switching node N0, surely Surely couple.At this point, the 2nd peak amplifier 102Off-state is still in, therefore compared with the 2nd peak amplifier 102Phase The output of position device 30, i.e. transmission lines TL02Output be regarded as short circuit, from node N1Inclusive transmission lines TL2As opening Line state, not to the 1st peak amplifier 101Output impact.
If output further increases, become the 2nd peak amplifier 102Also the compensatory zone acted, then the 2nd peak value amplification Device 102Output and the 1st peak amplifier 101Output in node N1It sentences identical phase to be coupled, this for carrier frequency with amplifying Device 100Output node N0Phase by pi.Moreover, in node N1Couple two obtained peak amplifiers 101、102It is defeated Go out two transmission lines TL via the length (pi/2) for being respectively provided with λ/4A、TLB, i.e. phase delay π and in node N0 and carrier frequency Amplifier 100Output coupled with identical phase.
Fig. 4 shows schematically the structure of 4 grades of counter-rotative type Doherty amplifier.It inputs to the RF signals of terminal RFin and passes through 2 grades 3dB connectors (Coupler) 20a~20c carries out 4 branches.One output of 3dB connectors is (defeated with input connection Go out) compared with another 90 ° of (output with input coupling) phase delay of output.Therefore, to the input received in 4 branches Carrier-frequency amplifier 100The phase of the RF signals of input postpones 180 °, intensity 1/4 compared with input terminal RFin.To peak value Amplifier 101The RF signals of input are 90 °, to peak amplifier 102The RF signals of input are 0 °, to peak amplifier 103Input RF signals for 90 °, each generate phase delay compared with input terminal RFin.
Carrier-frequency amplifier 100And each peak amplifier 10nThe output of (n=1~3) is respectively via in phase offset portion 30 Transmission lines TL00~TL03And it inputs to output coupling circuit 40.With transmission lines TL00~TL03Impedance Z0, circuit it is long L0。
In output coupling circuit 40, for carrier-frequency amplifier 100Direct output, by each peak amplifier 100~ 103Output respectively via transmission lines TL00~TL03It is coupled.That is, peak amplifier 101Output via transmission lines TL01, the 2nd peak amplifier 102Output via transmission lines TL02、TL01And the 3rd peak amplifier 103Output via Transmission lines TL03, with carrier-frequency amplifier 100Output in node N0It is synthesized.Herein, the input of carrier-frequency amplifier 100 With the phase for postponing 180 ° compared with input terminal RFin.Therefore, in switching node N0Place is shown in 180 ° of phase delay On the basis of add carrier-frequency amplifier 100In delay and by transmission lines TL00Phase obtained from caused delay.
For the 1st peak amplifier 101, input to the peak amplifier 101RF signals compared in terminal RFin Phase delay 90 °.In other words, the 1st peak amplifier 101The input phase for carrier-frequency amplifier 100Input, phase 90 ° in advance.And the 1st peak amplifier 101Output via the 1st transmission lines TL1In switching node N0Place amplifies with carrier frequency Device 100Output is synthesized.Transmission lines TL1With λ/4 length, therefore in transmission lines TL1Middle 90 ° of phase delay.Therefore, 1st peak amplifier 101The output phase for the phase in input terminal RFin, in the connector 20c of input stage generating 90 ° prolongs Late, in transmission lines TL1It is middle to generate 90 ° of delays and generate the 1st peak amplifier 101Interior and transmission lines TL0In delay And to reaching switching node N0.That is, have and carrier-frequency amplifier 100Output phase position and in switching node N0Place into Row synthesis.
For the 2nd peak amplifier 102, input rf signal is not with the phase delay in input connector 20a, 20c And it is inputted.That is, shift to an earlier date 180 ° of phase with the input compared with carrier-frequency amplifier 100 to input to the 2nd peak amplifier 102.But the 2nd peak amplifier 102Output via two transmission lines TL2、TL1To reaching switching node N0.Two transmission lines Road TL2、TL1The length of λ/4 is respectively provided with, therefore in two transmission lines TL2、TL1Generate phase delay 180 ° total. Compared with input terminal RFin, become and the 2nd peak amplifier 10 is added on the basis of 180 ° of the delay2In delay and transmission Circuit TL00In delay after delay.Amplifier architecture, transmission lines TL00~TL03Structure it is identical, therefore these amplification In device and transmission lines, in carrier-frequency amplifier 100With the 2nd peak amplifier 102Output do not generate phase difference substantially.Therefore, 2nd peak amplifier 102Output in node N0Place, with carrier-frequency amplifier 100, the 1st peak amplifier 101Output with identical Mutually synthesized.
For the 3rd peak amplifier 103, input in input stage branch circuit 20a and delay 90 ° of signal, the 3rd peak value Amplifier 103Output via transmission lines TL3To reaching switching node N0.Transmission lines TL3Length with λ/4, therefore produce Phase delay 90 ° raw.As a result, the 3rd peak amplifier 103Output with compared with carrier-frequency amplifier 100Output same-phase And in node N0Place and each amplifier 100~102Output suitably couple.
Variation on the impedance in combiner circuit illustrates.In only carrier-frequency amplifier 100The low output acted In region, peak amplifier 101~103It is off.But output impedance is not at infinitely great (∞), for example, Peak amplifier 101~103In the case of being made of the field-effect transistor (FET) of monomer, due to the knot electricity between Drain-Source Hold, for stray inductance possessed by the bonding line of drain electrode etc., its output in most instances cannot be regarded as opening a way.Fig. 5 (a) it is to schematically illustrate carrier-frequency amplifier 100, peak amplifier 101~103Drain side circuit diagram, Fig. 5 (b) shows at this time Smith chart.
In the drain load for the FET that each amplifier is included, the junction capacity between Drain-Source is certainly existed, is certainly existed The stray inductance as caused by being used to draw the bonding line of drain electrode.If it at this point, will will be counted from the electrode of FET inside FET Impedance including calculation is set to ZOUT_OFF, then this is on Smith chart, for example, being equivalent to the point Z of Fig. 5OUT_OFF.In the leakage of FET Pole exports, inserted with the match circuit being made of capacitor C, inductance L.Capacitance C in Fig. 4 is to be connected to the drain electrode of FET and connect Capacitance between ground is not parasitic component.In addition, inductance L represent by by the capacitance C of the match circuit and offset transmission lines into Inductance ingredient caused by the bonding line of row connection.By the match circuit, the point Z on Smith chartOUT_OFFAlong the outer of circle diagram Edge and turn right and be moved to point ZLC_OFF。
The transmission lines TL that phaser 30 is included00~TL03With making point ZLC_OFFIt is moved to the short circuit (0 Ω) of left end Until length.Point ZLC_OFFIt is present in the edge on circle diagram, therefore deviates transmission lines TL00~TL03Impedance be equivalent to Z0、 The long L of its transmission path0It is equivalent to from point ZLC_OFFUntil left end (Z=0).The reason is that from right end on Smith chart The distance that point is turned right until the point of left end is equivalent to λ/4, therefore in the example of fig. 6, transmission lines TL00~TL03Substantially have There is the length of λ/16.
As described above, impedance is converted by LC match circuits and offset transmission lines, thus in transmission lines TL00 ~TL03Output terminal, impedance is considered short-circuit (Z=0).Therefore, if in transmission lines TL00~TL03Each output terminal, Reconnect the transmission lines TL of long λ/4 of circuit1~TL3, then in the output of its load-side, the energy when each amplifier disconnects It is enough to be ideally regarded as opening a way.
On whole amplifiers 100~103It is accounted for during the maximum output for carrying out its saturation action.In addition, it is set to defeated Go out terminal RFOUTThe impedance of 50 Ω is connected with as its load.In maximum output, all amplifiers 100~103Output resistance Anti- matching is 50 Ω, therefore switching node N0In resultant impedance become 12.5 Ω.By exporting transmission lines TLTThis is synthesized 12.5 Ω of impedance is transformed to 50 Ω, therefore the impedance for exporting transmission lines becomes 25 Ω.
With in only carrier-frequency amplifier 100In the low output area acted, carrier-frequency amplifier 100Output impedance become The mode of 12.5 Ω sets the constant of LC match circuits.That is, 12.5 Ω of terminal impedance and carrier-frequency amplifier are output it 100Output impedance ZOUT_ONBetween impedance conversion, pass through LCMatch circuit 30 carries out.Similarly, to LC match circuits 30 Constant is set, so that in carrier-frequency amplifier 100With the 1st peak amplifier 101Progress saturation output action, other two Peak amplifier 102、103During disconnection, for carrier-frequency amplifier 100Offset transmission lines LT00Output terminal and for the 1st peak It is worth amplifier 101Offset transmission lines LT01The impedance of output terminal be set as 25 Ω.Carrier-frequency amplifier 100With two peaks It is worth amplifier 101、102Also can similarly consider during saturation action.
Fig. 6 shows the RF of 4 grades shown in Fig. 4 of reversion Doherty amplifierOUTIt intensity in terminal and observes at this time Efficiency.The compensation of -12dBc is obtained by output current 50dBm, and efficiency at this time is more than 60%.Until output is Until 50dBm, only carrier-frequency amplifier 100 acts, peak amplifier 10 between 50dBm~62dBm1~103Start to move successively Make.In addition, the reduction of substantive efficiency at this time is not observed.

Claims (5)

1. a kind of Doherty amplifier has a carrier-frequency amplifier and multiple peak amplifiers,
In the Doherty amplifier, have：
Distributor is inputted, input signal is allocated equally to the carrier-frequency amplifier and the plurality of peak amplifier；
Amplifier unit, it includes the carrier-frequency amplifiers and the plurality of peak amplifier；
Offset units, have respectively with the corresponding multiple offset transmission lines of the carrier-frequency amplifier and the plurality of peak amplifier Road；And
Output coupler couples the output of the plurality of offset transmission lines via multiple coupling transmission lines,
The plurality of offset transmission lines are to become the output impedance in the carrier-frequency amplifier and the disconnection of the plurality of peak amplifier It is changed to the transmission lines of short-circuit condition.
2. Doherty amplifier according to claim 1, wherein,
The amplifier unit is in addition to the carrier-frequency amplifier, and also with the 1st to the 3rd peak amplifier, which has： With the carrier shift transmission lines of the output connection of the carrier-frequency amplifier；It is and respective defeated with the 1st to the 3rd peak amplifier Go out the 1st to the 3rd offset transmission lines of connection,
The coupling unit includes switching node, and the output of the carrier shift transmission lines is directly connected with the switching node, with this The output of 1st offset transmission lines of the output connection of the 1st peak amplifier couples section via the 1st coupling transmission lines with this Point connection, the output with the 2nd offset transmission lines of the output connection of the 2nd peak amplifier couple transmission line via the 2nd Road and the 1st coupling transmission lines are connected with the switching node, the 3rd offset with the output connection of the 3rd peak amplifier The output of transmission lines is connected via the 3rd coupling transmission lines with the switching node.
3. Doherty amplifier according to claim 1 or 2, wherein,
The output of the Doherty amplifier is removed via the output transmission lines being connected with the switching node.
4. Doherty amplifier according to claim 2, wherein,
The carrier shift transmission lines, the 1st to the 3rd offset transmission lines and the 2nd, the 3rd coupling transmission lines have λ/4 Circuit is long, and impedance is equal with load impedance,
1st circuit of the coupling transmission lines with λ/4 is long, and 1/2 impedance with load impedance.
5. Doherty amplifier according to claim 3, wherein,
The output transmission lines have the circuit of λ/4 long, have 1/2 impedance of load impedance.
CN201711237150.4A 2016-11-30 2017-11-30 Doherty amplifier Active CN108123690B (en)

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US62/427,931 2016-11-30

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CN109327191B (en) * 2017-07-31 2023-10-24 安普林荷兰有限公司 Four-way doherty amplifier and mobile communication base station
US10601375B2 (en) * 2017-10-03 2020-03-24 Sumitomo Electronic Devices Innovations, Inc. Modified three-stage doherty amplifier
CN109660214A (en) * 2018-12-20 2019-04-19 佛山臻智微芯科技有限公司 One kind being applied to the 5th third-generation mobile communication base station Doherty power amplifier

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